Question

mandatory 【mandatory】adj.命令的；必须的It is mandatory to pay a debt within a certain period of time.在一定的期间内还债是必须的。

Accepted Answer

['mændətɔːri] 
mandatoryrequired by rule
In the US, attending school through the twelfth grade, driving on the right side of the road, and obtaining a social security number are all mandatory. The phrase "mandatory requirement" is redundant.
A mandatory action is something that is required, obligatory, or compulsory. Like letting your Great Aunt Edna pinch your cheeks or passing gym to get your diploma. Mandatory is often used in opposition to optional. If you want to compete with the swim team at school, weeknight practices are mandatory, meaning you have to go, though the Saturday dawn swim practice remains optional, meaning it's up to you.
All forms of 'mandatory' will appear on average once every 3013 pages.mandatarymandatemandatorymandatorilynonmandatory

Front	mandatory
Pron	['mændətɔːri]
Back	【mandatory】 adj.命令的；必须的 It is mandatory to pay a debt within a certain period of time. 在一定的期间内还债是必须的。
Vocab	mandatoryrequired by rule In the US, attending school through the twelfth grade, driving on the right side of the road, and obtaining a social security number are all mandatory. The phrase "mandatory requirement" is redundant. A mandatory action is something that is required, obligatory, or compulsory. Like letting your Great Aunt Edna pinch your cheeks or passing gym to get your diploma. Mandatory is often used in opposition to optional. If you want to compete with the swim team at school, weeknight practices are mandatory, meaning you have to go, though the Saturday dawn swim practice remains optional, meaning it's up to you. All forms of 'mandatory' will appear on average once every 3013 pages. mandatary mandate mandatory mandatorily nonmandatory

Mandatory Swim Meaning Mændətɔːri Adj.命令的；必须的 Pay Debt Period